Machine for grinding material



Oct. 13, 1936. J. M INTYRE MAcHi E FOR GRINDIING MATERIAL Filed June 19, 1935 l t W MWC v I. n

Patented Oct 13, 1936 UNITED STATES MACHINE FOR GRINDING MATERIAL John McIntyre, Portobello, Edinburgh, Scotland Application June 19,

1935, Serial No. 27,434

In Great Britain June 23, 1934 1 Claim.

This invention relates to cylinders or rolls of grinding machines for use in connection with the grinding of paint, chocolate and the like. Grinding surfaces for such cylinders or rolls have been composed of a number of hard metal strips interlaced with strips or laminations of softer material in order to form virtual grooves between the said strips, which do not'wear away.

The object of the present invention is to devise to their foundation.

The invention will now be described by way of example with reference to the accompanying drawing, in which:

of a cylindrical internal grinding surface.

Figure 2 is the same as Figure 1, only showing an external cylindrical grinding surface. v

Figure 3 1s arsection of Figure 1 and Figure 2 in a plane passing through the axis.

Referring to- Figures 1, 2 and 3, a cylindrical foundation A is provided with a central dovetailed projection B, and on this are mounted a number of hard metal plates 0 and between each of these hard metal plates a strip or lamination D of softer material is placed which'separates each plate C from the other. The strips D and C may be provided with holes E through which wires or the like may be placed, so as to secure the plates in position. As shown in Figure 3, a central band F is placed round the plates, if desired, to secure them in position for the external grinding surface shown in Figure 2. The internal grinding surface in Figure 1 is not provided with this ring F. The strips C and D are arranged to lie at right angles tothe direction of motion. They may, however, be slightly inclined to the direction of motion.

On each side of the cylinder is provided a ring or plate G which has an overlapping portion H and which is secured by suitable screws or the like tothe foundation or ring A, so as to lock the plates C and D firmly in position. Any other means may be employed for securing the plates to the foundation and that described is only given as an example. V

The plates C and D form a composite grinding surface K which is composed of hard plates separated by or interleaved with stripsor laminations of softer material.

The hard metal plates 0 are preferably made of chilled cast iron or hardened steel and the softerstrips or laminations D may be made of any suitable material, which may be a metal softer than that used for the parts 0 or may be made new and improved means for securing said strips Figure l is an end view with a portion removed,

of linen, cotton, wood, felt, paper, leather, celluloid, or the like. Further, the softer strips or laminations D -may be formed by coating the faces of the hard strips C with a coating of cement, paint, varnish, enamel or any other suitable material.

When the softer parts are formed of metal they may be formed by depositing a soft metal on the. sides of the plates C by electro-plating, spraying, brazing or other suitable means, or the soft metal parts may be made of foil which acts as a thin lamination between the hard plates C, or again the hard portion of the metal plates may be formed by case hardening, as shown in Figure 6 by the feather shading at L, while the soft metal part is formed by the portion of the plate not case hardened between the two case hardened surfaces. This, of course, can be arranged to be of any thickness according to the depth of penetration of the case hardening and the thickness of the plate. Similarly, the sides of the hard plates, if hard all through, might be annealed or softened to provide the thin portion of soft material.

The thickness of the hard plates C and the soft plates D may be varied according to the material to be ground and the refinement of the grinding desired.

It is to be noted that the soft plates separating or interleaved between the hard plates will form a grinding surface which, although having a smooth surface to the eye, will provide virtual grooves between each hard plate, and therefore, by arranging the thickness of the soft plates, coarse or fine grooves can be provided, and these grooves will never wear away but will always remain, as long as the hard surface is left. Thus, no amount of wear will alter the ratio of the area of the virtual grooves to the area of the hard plates, and therefore the life of the grinding surface will be very long, until the plates have been 40 ground down practically to the foundation.

It is to be understood that the grinding cylinder or roll can be used in any kind of grinding machines, pug-mills, millangers or the like, and that the hard and soft plates or strips may be arranged at aslight inclination to-the direction of motion, and the sizes made tosuit varying conditions, without departing from the scope of the invention.

1 claim:

A composite grinding surface comprising a cylindrical foundation, a dovetail projection upon ,said foundation running in the direction of motion, a plurality of hard metal strips having a dovetail recess engaging with said projection upon 55 said foundation and arranged longitudinally of the axis of said foundation, a plurality of strips of softer material provided with a dovetailed recess and interleaved between said hard metal strips two annular disks having flanges which engage over the ends of said strips, said strips having substantially midway of their grinding surface a recess, a ring disposed about said strips in said recesses and means for securing the said annular disk to the said foundation.

JOHN MCINTYRE. 

